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Old 09-29-2012, 01:05 PM   #1
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Default AEM WB gage install wiring.

Be gentle please.


Could I get some help wiring up my WB sensors. (PLAN- Use with the EMU.)

Instructions say-
Red Wire- Connect to switched 12v......... What is the best place to tap this?

BLK Wire- Connect to clean ground....... Best place?

White Wire- <Analog Output> Connect to any aux unit that accepts 0-5v input. Where does this go? Will I have an analog gage wth out this?

BLU Wire- Connects to a RS-232 com port for hyper-terminal data logging. What is this?

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Old 09-29-2012, 05:17 PM   #2
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I think people here are going to tell you to tap it to the same power/ground the ECU uses.

But... Mine is spliced into the cigarette lighter wiring and I haven't had any issues with it. Popping the cigarette lighter out and splicing into the wiring is probably the easiest and most ghetto option. Preferably you'll want to strip the existing wire with some scissors, then use the "twist the wire around the other wire" method, and use some painters tape to hold it in place since you can't find any electrical tape.

If you wire red and black, and connect the sensor the gauge will work. You will connect the white wire to your piggyback which will allow you to tune and datalog off of it (rather than the stock narrowband). I've got no idea what the blue one is for.
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Old 09-29-2012, 06:47 PM   #3
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the white or blue is depending on if you want serial or analog. otherwise yeah, its 3 friggen wires, not much to it.
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Old 09-29-2012, 07:02 PM   #4
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I have all my switched 12v coming from the power window harness in the center console. If you don't have power windows and the factory harness is there, it's just an easy spade connector. If you have power windows, it's an easy splice into an existing wire.

Ground should be connected to the same place as the ecu. So pretty much the ground by the throttle body.

White, hook up to ecu, like megasquirt

blue, don't worry about it
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Old 09-29-2012, 07:23 PM   #5
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The the OCD in me do I need a ECU PIN out diagram to trace to ecm SW 12v & ground?
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Old 09-29-2012, 07:24 PM   #6
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Quote:
Originally Posted by bmxfuel007 View Post

Ground should be connected to the same place as the ecu. So pretty much the ground by the throttle body.
can you be more specific here?
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Old 09-29-2012, 07:25 PM   #7
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If you were to run three or so gauges off the power window harness or cigarette lighter, would it cause any issues?
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Old 09-29-2012, 07:30 PM   #8
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Quote:
Originally Posted by bmxfuel007 View Post
I have all my switched 12v coming from the power window harness in the center console. If you don't have power windows and the factory harness is there, it's just an easy spade connector. If you have power windows, it's an easy splice into an existing wire.
Is it one of these?
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Old 09-29-2012, 07:33 PM   #9
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Cigarette lighter is ok provided you don't connect anything really power hungry to the socket (worst case the fuse will blow).

Power window harness - I would rather not, because you are more likely to draw many amps through that (both windows up or down at the same time, and all the gauges together).

The bad news is that if the fuse blows, you must replace it immediately or very soon - the wideband sensor must not be in the exhaust unpowered or it will be destroyed very quickly.
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Old 09-29-2012, 08:03 PM   #10
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Quote:
Originally Posted by Reverant View Post
Cigarette lighter is ok provided you don't connect anything really power hungry to the socket (worst case the fuse will blow).

Power window harness - I would rather not, because you are more likely to draw many amps through that (both windows up or down at the same time, and all the gauges together).
My car does not have powered windows.

What wire do you suggest I use for the sw 12v....tap into the oem ecu wire bundle?

THX
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Old 09-29-2012, 08:06 PM   #11
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If you don't have power windows, you're in the clear - go ahead and use the power off that connector. The ground needs to be on the same wire as the ECU though.
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Old 09-29-2012, 08:20 PM   #12
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Quote:
Originally Posted by Reverant View Post
..... go ahead and use the power off that connector. The ground needs to be on the same wire as the ECU though.
Can you indicate which connector...the small one or the bigger one + where do I access the ecu ground?
THX
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Old 09-30-2012, 05:26 AM   #13
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The big, 6-way one.The ECU grounds are located on the kick panel under the passenger's feet.
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Old 09-30-2012, 08:47 AM   #14
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Quote:
Originally Posted by Reverant View Post
The big, 6-way one.The ECU grounds are located on the kick panel under the passenger's feet.
Thank you, you have saved me a lot of time.
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Old 09-30-2012, 09:27 AM   #15
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Default Part 2

Where is the best place to pass the sensor plug thru the fire wall?

Do I need to cut a hole?
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Old 09-30-2012, 10:29 AM   #16
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Quote:
Originally Posted by scratchedup View Post
Where is the best place to pass the sensor plug thru the fire wall?

Do I need to cut a hole?
Put it under the shift boot. It's how I did it.

I'm sure if you're super ---- retentive you could setup some kind of bulkhead pass-through after drilling a hole in the transmission tunnel. Jamming it under the rubber boot worked for me.
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Old 09-30-2012, 05:15 PM   #17
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Can anyone tell me a not to painful way to access the lighter...how can one pop it out and or how much disassembly of the dash is required to get to these wires?

This plug is totally dead in all ignition s/w position including with the engine running.

+ wot is the other little white plug?

THX
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Old 09-30-2012, 06:10 PM   #18
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is there a fuse in the panel for that circuit?
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Old 09-30-2012, 06:24 PM   #19
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Yes, "power windows".
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Old 09-30-2012, 06:31 PM   #20
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Yeah, I was more or less asking if he checked if there is a fuse in the spot.
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